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Generally, a set of tyre last for about 40,000 kms. 4500 km is very short distance to notice any tyre wear. However, you should inspect them for the possible damage caused due to driving on the bad roads, specially tyre sidewall damage. Look out for cuts or Bubbling of sidewall. Checkout this link to know more about sidewall bubble- http://tyres.cardekho.com/news/?p=462